Method:Heat pan on gas. Add a tspful of oil.Add sweet corn kernels and saute well for 5 minutes stirring continuously. Keep aside once done.Chop onion and tomatoes.Dice boiled potato in cubes.In a bowl mix together corn kernels, chopped onion, tomato and potato.Add red chilli powder, chaat masala and salt to taste.Add lemon juice in this mixture and mix all the ingredients well.Serve in bowls and garnish with chopped cilantro and sev.